Rotary fan.



J. R. ROBINSON.

ROTARY FAN.

APPLIUATION FILED MAR. 2s, 1909.

956,781 O Patented May 3, 1910.

2 SHEETS-SHEET 1.

` y f l O l J. R. ROBINSON.l

ROTARY FAN.

APPLICATION HLED MAB.23,1909.

Patented May 3, 1910.

2 SHEETS-SHEET 2.

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4 5 Referring-Ito the drawings there is shown a 1 shaft 1' mounted `in-j journal @bearings 2l Qinounti-ng' for the shaftshown in the' drawainmaylbe'chaned as' desired.` It is to be' e shaft 'is to be suppliedvvision plate or web intermediate'v of the from-a consideration of. thefollowing'def the' drawingsz-e-Flgure-'l 1s a perspecftive' view of therotor 'detached from .the '40 easing.'v Fig. 2 is a eentral'seetionthrough vthe' rotor andcasing onel lai-ger scale than shown in Fig.'1.Y

'apart-ly in 'section -an understood' that t UNrrED STATES r-ATENTOFFICE.

JAMES REED aomNsoN, or MOUNT LEBANON, PENNSYLVANIA.

ROTARY FAN.

Application ined March 2s,

To all whom 'it may :Be it known that I, JAMES REED ROBIN- soN, acitizen of the United States, residing at Mount Lebanon, in the'countyof Allegheny and State of Pennsylvania, have invented a new apd .usefulRotary Fan, of which the following isa specification.

This invention has 'reference to improvements in rotary fans and is animprovement upon the fans shown in Letters -Patent No.' 866,887, grantedto me on September 24th, 1907, for improvements in rotary fans, and finLetters Patent No. 673,47 7 granted to me on May 7, 1901, forimprovements in fans.

In accordance with the presentinvention the fan rotor is made double,that is the air is drawn in at each end of the fan and dis' charged' atthe periphery, there being a dilength of the fan. The intake'openings tothe 'fan are -made by providing the rotor with. a sleeve* which extendsout through the ening in the casing, and the main-fan b ades whichextend from the hub to the through and-beyond the louter edge of theturned in the-direction'of rotation of thev said rotor'.

The invention will bebest understood-' 'tailed descriptiontaken. inconnection with 'the accompan ing drawings'forming a p art ofthis. specication, but 1t is tlobev. under- -stood that the .inventionisg by noAmealns confined to the exactform or proportions 'or 3 is an endelevation partly .broken away of the fan and its casing..

pon s' uitable pedestals '3, nt the particular 1n forms no part of thepresent linvent-ion with la suitable pulle for the applicationof powerolf-maybe irectly coupled to an en electric'motonor turbine. ast o ntheshaft is a hub formed oftwo' 4like members'- 4, 4, J'Qinedat theirSpecication of Letters Patent Patented May 3,1910. 1909. vserial No.485,184.

bases and havin their apices" remote one from theother.

he faces of the'hub members ma be curved. y Clamped between the bases othe two-members of the'lmb is an annular web 5 extendingl ra'dix 1.ll flfrom vthe hub. The rivets whi'c serve to Vsecure the bases of the twomem'berssof the hub to ether' also serveto secure the web 5 to the ub.

Each member 4 of theA hub carries. the inner end of a number of vmainfan-blades (i, the inner edges of these blades beingconnected into thehub membersft by suitable rivets extending through ian es 7` formed onthe outer surface 'of the hu section. 'In the drawings four such bladesare shown for each hub section and the flanges 7 are d isplaced so thatthe fan blades lie-tangential toa circle about the diameter of the shaft7 or'a little larger, and the said fan blades slant slightly as shown.'T-he blades G extend -tovthe periphery of nitivardl therotor and alongthe web 5 are secured thereto by angles 8 riveted .to the blades and tothe said angles.l That portion of the peripheral part of each blade Gremote from secure the ring 10 to the blades 6. For a distancecoincident-With the width of each.

ringlO the blades are curved ordished as shown atl 12 vand'this.'d1shedf port1on may Vbe Substantially radiales indicated' 1n. the

drawings. Between `the blades'f't-he rings 10 carry a number ofperipheral blades 13` 'similar tothe 'dishedv portion 12 of the blades 6and these short'peripheral blades, are equi-distan'tl disposed betweenthe several main bla es 6. v `Fast on the outer: face of, each -rlng 10-and'coincident with the .inner periphery of the lring is a sleeve 14provided with a radial.

flan lberlveted to the corresponding' ring' 10. '4

1 5 by means of which' the-sleeve ma-,v

The 'ends of the blades' 6 'projecting in thedirectionof the axis of therotor extend 'through and beyond the sleeve 14 and are there curved in'thedirection of rotation as indicated at 16.l Y-

Surrounding the fan rotor is a casing 17' which may 'be shaped as usualand 1s provided with a disehar e'throat. A n annular' face plate 19carrie by the casing closes vin the clearance space between the rotorand' the side walls 'of the casing.

ros

When the fan is in operation the forwardly curved projecting ends 16; ofthe main' fan blades enga e the air and direct it into the interior othe rotor where it is met by the conical hub section and thrown bodilyoutward to the periphery of the fan rotor and this outward movement ofthe air is further assisted by the tangential inclination of the fanblades. As soonl as the outmoving body of air reaches the peripheralblades 13 it is caught by the latter and directed into the casing 17 tofinally escape -throgh the throat I1 By providing the forwardly curvedprojecting ends 16 of the fan blades not only areall the advanta es ofthe construction of thel fan of the a oresaid Letters Patent retained inthe fan' structure of the presentl invention, but insteadjof dependingon air pressure to supply the vacuum created by the outmovug air columnwithin'the fan rotor the'air is directed into the interior of the fanrotor by the mechanical action of y.the curved blades 16 `upon' the aircolumn.

Experience `has demonstrated -that vthe eiliciency of the fan ismarkedly increased by the addition of the curved blades 16. Also y Vbyextending the intake opening of the fan .and fina'in fan blades extendintially direct line from the hu of the rotor orifice an rotation, nthemain fan blades at and beyond l rotor well beyond the orice of thecasing` the retarding eil'ect of any air currents which may returnthrough" the clearance space of the casing is obviated.

vWhat is claimed 1. In a blast fan, a rotor havin anaxiallyextended'intake orifice, a conica hub with `the apex'extendinginto the-intake orifice,

in a substanto near the .periphery lthereof and from thence continued 1na forward curve to the periphery, said main blades also extending axia1y be ond the axially extended intake there curved in the direction ofWitnesses z.

the intake'orifice bein cb-extensire with the distance from the hui tothe perlphery of the intake orifice.

2. In a blast fan, a rotor havin an axially extended intake orifice, aconica hub with the apex extending into the intake orifice, main fanblades extending in a substantially direct line from the hub of therotor to near the peripher thereof and from thence c011- tinued in aorward curve to the peri hery, said mainblades also extending axia lybeyond the axiallyl extended intake orifice and there cextensive withthe distance from the hub to the periphery of the said intakeoriicersaidblades beyond the intake orifice being curved in the direction ofArotation, and peripheral Afan blades between the main fan blades. v

' 3. In a blast fan, a rotor having at each end an axially extendedintake orifice, a hub stormed of two conical members joined at theirbases and having their apices extending into the intake orilice, acentral annular web extending radially from the joined bases of the hubmembers to the periphery of the rotor, main lfan blades extending in asubstantially direct line from the hub of the rotor to near theperiphery thereof and from thence continued in a forward curve to theperiphery and also extending axially from the web to a pointbeyonditheaxial extension 'of the intake orifice, said axial exten sionsof the main fan blades being co-exten sive with the distance from thehub to, the pein the direction of rotation, and peripheral -fanblades'between the main fan blades.V

In testimony that I claim the foregoing as my own, I have hereto aliixedmy signatureV in the Apresence of two witnesses.

' JAMES REED'ROBINSON.

. M. ALICE McACo-Ms, FRED. C. GROTE.

